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concave pistons

D

David Lampman

Member
Hi Again,
In my parts tractor (it's an A), the pistons were concave. quite deeply concave. Would these pistons be the ones used in a "distillate" or muti-fuel 123 engine? If not what were their purpose? I ask because that A didn't have the multi fuel parts, like a separate 1 gal. tank for gas and it had a standard gas carburetor on it.
Dave
 
It could well have low compression piston in it. Who knows what all has been done to a tractor over the years. I know all the A/B engines I have messed with had flat top piston in them but even those where not all the same
 
I hear you there Old,
I've pulled apart three 123 engines and found Four different pistons. One piston was a flat top with two compression rings, two center rings and a single one piece oil ring. I found flat tops, flat tops with rounded edges on the top, concave tops, 4 ring, five ring 1/4" oil rings and some smaller size oil rings. All that in just three engines! I'm guessing it's from multiple one piston rebuilds in the past. I guess back then you did only what you had to do to Get Her Done.
Anyone else got any info on the concave pistons? Why on earth would they have wanted lower compression in these engines anyway?
Dave
 
The flat top piston distillate engines were only about 4.6 to 1 compression ration anyway. Why go lower? Maybe cheap pistons from somewhere else.
 
Yes thats what they are ive took a couple of the distillate engines apart and thats what their pistons look like and not a different head. They had three pistons for the different altitudes.
 
They were not flat top. The flat tops were for lower altitude higher alt had different tops. Parts info lists many pistons that were used.
 
Thew concave piston most likely where for a distillate fuel engine but then as you know they used what they could back then and got by the best they could
 
Let me help everyone out here. The concave piston were absolutely for the distillate conversion for the C-113 engine. I have an original 1939 Serviceman's guide for the Farmall A. It specifically calls these out. I also have a set of them.

There were 3 sets of pistons available for the C-113 engine. Distillate, regular, and high altitude. The distillate pistons are concave, and were an option.

I will try to post the exact numbers out of the guide later tonight if I get a chance.
 
No didnt you read the answers we told you that the concave pistons were for the dual fuel or whichever fuel you want to go by. Those engines started on gas then were switched to the cheaper fuel and those engines came from the factory with the concave shaped pistons. The stepped head were for gasolene engines and they had 5000 ones and 7000 ones. The flat head would have been for engines below 5000. I have stepped head pistons with I-H#s also the concave ones with I-H#s also flat head with I-H#s
 
Gene, good point. I am only quoting the book. It indicates that the lower compression pistons were an option, complete with it's own part #. In 1939, it appears that the A came standard with an engine configured for gasoline. Also, the front axle was solid, and non-adjustable. No starter.

It goes without saying that as time progressed who knows what was left to the dealer and what was done at the factory. I do know the Serviceman's Guide clearly states what was stock and what was optional.

Interesting discussion.
 
Yes Gene I did read the asnwers. I was refering to athol carr's answer. Didn't you read his answer? Also his answer was before the responses that were more comprehensive. Gees!
 
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